I notice this two-way use of the 'MUS' acronym. I'm regularly told off for interpreting it as 'Multiple' Unexplained Symptoms rather than 'Medically' Unexplained Symptoms. Seems I'm not the only one who uses the former term at times. I have seen both used on formal documents... That there doesn't *seem* to be an official line (???) on which is correct makes the use of these acronyms even more of a muddle than of course their very existence underscores.